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+// Example 4.9 : Design of given circuit to obtain I_D=0.5mA
+I_d=0.5*10^-3; // (A)
+I_S=0.5*10^-3; // (A)
+V_t=1:0.5:1.5; // (V)
+K_n=1*10^-3; // K_n=k_n*W/L (A/V^2)
+V_DD=15; // (V)
+V_D=10; // (V)
+V_S=5; // (V)
+R_D=(V_DD-V_D)/I_d;
+R_S=V_S/I_S;
+V_OV=sqrt(I_d*2/K_n);
+V_GS=V_t+V_OV;
+V_G=V_S+V_GS;
+// V_t=1.5V
+// I_D=K(V_GS-V_t)^2/2
+// 7=V_GS+10I_D
+// solving above equations 
+I_D=0.455*10^-3;
+deltaI_D=I_D-I_d; // Change in I_D (A)
+change=deltaI_D*100/I_d; // Change in %
+disp(change,"Change in I_D (%)")
+\ No newline at end of file